X-ray Absorption Spectroscopy of Ground and Excited Rhenium?Carbonyl?Diimine Complexes: Evidence for a Two-Center Electron Transfer

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F13%3A00388677" target="_blank" >RIV/61388955:_____/13:00388677 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1021/jp3106502" target="_blank" >http://dx.doi.org/10.1021/jp3106502</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/jp3106502" target="_blank" >10.1021/jp3106502</a>

Jazyk výsledku

angličtina

Název v původním jazyce

X-ray Absorption Spectroscopy of Ground and Excited Rhenium?Carbonyl?Diimine Complexes: Evidence for a Two-Center Electron Transfer

Popis výsledku v původním jazyce

Steady-state and picosecond time-resolved X-ray absorption spectroscopy is used to study the ground and lowest triplet states of [ReX(CO)3(bpy)]n+, X = Etpy (n = 1), Cl, or Br (n = 0). We demonstrate that the transient spectra at both the Re L3- and Br K-edges show the emergence of a pre-edge feature, absent in the ground-state spectrum, which is associated with the electron hole created in the highest occupied molecular orbital following photoexcitation. Importantly, these features have the same dynamics, confirming previous predictions that the low-lying excited states of these complexes involve a two-center charge transfer from both the Re and the ligand, X. We also demonstrate that the DFT optimized ground and excited structures allow us to reproduce the experimental XANES and EXAFS spectra. The ground-state structural refinement shows that the Br atom contributes very little to the latter, whereas the Re-C-O scattering paths are dominant due to the so-called focusing effect. For t

Název v anglickém jazyce

X-ray Absorption Spectroscopy of Ground and Excited Rhenium?Carbonyl?Diimine Complexes: Evidence for a Two-Center Electron Transfer

Popis výsledku anglicky

Steady-state and picosecond time-resolved X-ray absorption spectroscopy is used to study the ground and lowest triplet states of [ReX(CO)3(bpy)]n+, X = Etpy (n = 1), Cl, or Br (n = 0). We demonstrate that the transient spectra at both the Re L3- and Br K-edges show the emergence of a pre-edge feature, absent in the ground-state spectrum, which is associated with the electron hole created in the highest occupied molecular orbital following photoexcitation. Importantly, these features have the same dynamics, confirming previous predictions that the low-lying excited states of these complexes involve a two-center charge transfer from both the Re and the ligand, X. We also demonstrate that the DFT optimized ground and excited structures allow us to reproduce the experimental XANES and EXAFS spectra. The ground-state structural refinement shows that the Br atom contributes very little to the latter, whereas the Re-C-O scattering paths are dominant due to the so-called focusing effect. For t

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/LD11086" target="_blank" >LD11086: Kvantově chemická interpretace a predikce spektrálních vlastností komplexů těžkých přechodných kovů.</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physical Chemistry A

ISSN

1089-5639

e-ISSN

—

Svazek periodika

117

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

361-369

Kód UT WoS článku

000313920200012

EID výsledku v databázi Scopus

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